Dual gas flow sliding arc ignition and flame holding device

Abstract

The application discloses a double-gas-flow sliding arc ignition and stable combustion device and belongs to the technical field of plasma application. The device comprises a high-voltage electrode, a ground electrode, a ceramic rotary gas ring, a pulse regulator and a fuel distributor. After a discharge gas enters a rear seat inner cavity from a gas inlet, the pulse regulator is arranged in the rear seat inner cavity, the discharge gas forms a pulse gas flow with continuously changed flow rate after the pulse regulator, the pulse gas flow generates a same-direction rotary gas flow through the ceramic rotary gas ring and a ceramic plate on the high-voltage electrode to drive the arc root of the high-voltage electrode and the ground electrode to repeatedly move in a spiral line, and the fuel distributor divides fuel into two stages, and the fuel is ignited in stages. In the application, the arc root repeatedly moves in a spiral line on the high-voltage electrode under the action of the pulse gas flow, the moving area of the arc root is large, the cooling effect of the electrode is good, and the sliding arc power and the electrode service life are effectively improved. With the fuel being ignited in stages by the fuel distributor, a large-volume high-energy ignition flame can be obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of plasma application, and in particular relates to a dual-airflow sliding arc ignition and combustion stabilization device. Background Art

[0002] As an emerging technology, gliding arc plasma is increasingly being used. Due to its relatively simple generation process and the ability to produce a large number of active free radicals and high-energy electrons, it has a wide range of applications in the degradation of volatile organic compounds, treatment of high-concentration organic wastewater, degradation of dioxins in fly ash, and production of synthesis gas and hydrogen.

[0003] In recent years, with the growing calls for carbon reduction and energy conservation and emission reduction, carbon-free energy has garnered increasing attention, and many emerging technologies have been applied to ignition and combustion. For example, ammonia, as a combustible fuel, is gradually replacing fossil fuels in many applications. However, due to its slow ignition velocity of only 7 cm / s and high ignition point of 651°C, ammonia combustion presents significant challenges. Ammonia cannot be ignited using high-energy ignition methods like natural gas or oil. In many ammonia combustion applications, the combustion chamber is first heated to above 800°C using natural gas or electric heating. Ammonia and air are then introduced into the chamber in a specific ratio and mixture, and ignited by a high-energy igniter. This ignition method requires a large amount of energy to preheat the furnace chamber, and the furnace can take several hours to bake, resulting in energy waste and slow production startup.

[0004] Currently, plasma ignition methods include direct current (DC), alternating current (AC), high-energy, pulse, corona discharge, microwave, and spark. Each of these approaches must consider electrode life. For example, direct current (DC), alternating current (AC), corona discharge, and microwave protect the electrodes by reducing igniter power. High-energy, pulse, and spark ignition protect the electrodes through intermittent ignition. These ignition methods generate only a few watts to tens of watts, insufficient to ignite fuels with high ignition points and slow ignition speeds, such as ammonia.

[0005] To improve ignition characteristics, some existing technologies employ multiple high-voltage electrodes or multiple ground electrodes. For example, Chinese patent application publication number CN 111120112 A discloses a multi-ground-electrode sliding arc plasma igniter and ignition method based on combustion chamber secondary flow. By changing the number of ground electrodes and utilizing the pressure difference between the combustion chamber secondary flow and the flame tube to drive sliding arc discharge, combined with a specific ignition power supply, multiple sliding arcs can be generated simultaneously. This increases the contact area between the plasma and the oil-gas mixture, increases the size of the initial fire core, and improves the ignition capability of the sliding arc plasma igniter. However, this method still cannot completely solve the problems of low ignition energy, small ignition high-temperature zone area, and only ignition of easily combustible fuels.

[0006] In summary, a plasma igniter is needed that can solve the problems of low ignition energy, small area of ​​high-temperature zone, and only being able to ignite fuels with low ignition point and slow flame propagation speed. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention provides a dual-airflow sliding arc ignition and stabilization device, in which pulsed rotating airflow is introduced into the inside and outside of the high-voltage electrode which is most likely to burn. Under the action of the pulsed rotating airflow, the arc root of the high-voltage electrode performs radial repeated spiral motion, and the moving area of ​​the arc root of the high-voltage electrode is increased to reduce ablation and enhance the electrode cooling effect. In this way, the plasma power can be effectively improved to prevent ablation, and the electric power of the commonly used igniter can be increased from tens of watts or hundreds of watts to about five kilowatts, thereby obtaining a large-volume, high-density, and multi-active particle plasma.

[0008] The sliding arc breaks through the gas to form plasma. General devices only have one gas path outside the high-voltage electrode and the gas flow needs to match the power, so the amount of air activated by the plasma is limited. The present invention adopts the method of increasing the rotating airflow inside and outside the high-voltage electrode at the same time, so the plasma power can be significantly improved. The dual-path pulse rotating airflow can increase the amount of activated air to about 200L / min, and continuously generate a large volume of plasma for ignition while also generating a large number of active particles, thereby greatly improving the ignition and combustion-supporting characteristics of the igniter.

[0009] After passing through a pulse regulator, the discharge gas forms a pulsed airflow with a continuously changing flow rate. This pulsed airflow, passing through the ceramic swirl ring and the ceramic plates in the high-voltage electrode, generates a co-rotating airflow, driving the arc roots of the high-voltage and ground electrodes in repeated helical motion. The fuel distributor then divides the fuel into two stages, igniting them in stages. In this invention, the arc roots, under the influence of the pulsed airflow, repeat helical motion on the high-voltage electrode, resulting in a large arc root motion area and effective electrode cooling, effectively increasing the sliding arc power and electrode life. Assisted by the fuel distributor for staged fuel ignition, a large-volume, high-energy ignition flame can be obtained.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] A dual-flow sliding arc ignition and stabilization device includes a high-voltage electrode, a ground electrode, a ceramic cyclone ring, a pulse regulator, and a fuel distributor; the discharge gas enters the rear tail seat cavity from the air inlet, and the rear tail seat cavity is equipped with a pulse regulator. The pulse regulator includes a valve body, a valve core, and a motor. The valve body is provided with a plurality of holes of different sizes, and the valve core has a gas regulating hole. The valve core rotates at a certain speed under the action of the motor, and the holes on the valve core continuously overlap with the holes of different sizes on the valve body. The air passes through the gas regulating hole of the valve core and then passes through the valve body in turn. The small holes, medium holes, large holes and extra-large holes on the rear tailstock form a fluctuating pulse airflow, the inner thread of the rear tailstock is threadedly connected to the ceramic cyclone ring, the ceramic cyclone ring is connected to the high-voltage electrode, the ground electrode support tube is threadedly connected to the outer thread of the rear tailstock, the ground electrode support tube and the high-voltage electrode are coaxially arranged, the ground electrode is threadedly connected to the inner thread of the ground electrode support tube, the fuel distributor is threadedly connected to the outer thread of the ground electrode support tube, the rear tailstock is installed on the rear seat, and an outer tube is installed on the rear seat, the high-voltage wire is connected to the high-voltage electrode and is connected to the power supply through the high-voltage wire hole of the rear tailstock.

[0012] Furthermore, the high-voltage electrode is a hollow structure, and is connected to the inner cavity of the ceramic cyclone ring via a vent. A ceramic plate is built into the middle of the high-voltage electrode, and the ceramic plate has multiple cyclone holes, and the direction of the cyclone holes is consistent with the cyclone holes of the ceramic cyclone ring.

[0013] Furthermore, the high-voltage arc starting end is a circular ring structure, and a cooling fin ring is provided on the outside of the high-voltage arc starting end. After the pulse gas enters the ceramic cyclone ring, it is divided into two parts. One part flows along the outer wall of the high-voltage arc starting end through the cyclone hole of the ceramic cyclone ring, and the other part first enters the inner cavity of the high-voltage electrode through the air vent of the high-voltage electrode, and forms a cyclone under the action of the ceramic plate to flow along the inner wall of the arc starting end of the high-voltage electrode.

[0014] Furthermore, the airflow on the inner wall of the arc starting end of the high-voltage electrode has the same direction as the airflow on the outer wall of the high-voltage electrode.

[0015] The high-voltage electrode and the ground electrode are arranged coaxially, and the gap between the outer diameter of the high-voltage electrode and the inner diameter of the ground electrode support tube is 1.5mm-4mm. The interior of the ground electrode has three structural features: a necked opening, a flat opening, and a flared opening. The axial distance between the necked opening and the high-voltage electrode is 20mm~30mm. The necked opening, flat opening, and flared opening are arranged in order from near to far according to the distance between them and the high-voltage electrode.

[0016] Furthermore, the fuel distributor is threadedly connected to the outer ring of the ground electrode support tube.

[0017] Furthermore, a plurality of inclined slots are provided in the middle of the fuel distributor, and the angle between the inclined slots and the central axis of the fuel distributor is 15°-75°. The fuel distributor is made of high-temperature resistant metal.

[0018] Furthermore, the valve body is provided with a normally open plate hole, the speed of the motor is adjustable, and the diameter of the gas regulating hole on the valve core is greater than or equal to the extra-large hole.

[0019] Furthermore, the fuel enters the cavity between the tailstock and the rear tailstock from the fuel inlet, passes through the gas equalizing hole of the ground electrode support tube, and a portion of the fuel is ejected out of the igniter along the gap between the outer tube and the fuel distributor.

[0020] Furthermore, a portion of the fuel enters the inner side of the fuel distributor through the chute, and the fuel entering the inner side of the fuel distributor accounts for 10%-50% of the total flow.

[0021] Furthermore, the air passes through the branch path, and under the action of the ceramic cyclone ring and the first cyclone hole inside the high-voltage electrode, there is a rotating airflow on both the inside and outside of the arcing end of the high-voltage electrode, or two rotating airflows are respectively introduced into the inside and outside of the arcing end of the high-voltage electrode.

[0022] The beneficial effects of the present invention are:

[0023] 1. The igniter of the present invention uses a specially designed annular electrode to introduce a rotating airflow into the inner and outer walls of the electrode. Under the action of a pulse regulator, the airflow moves radially in a spiral and axially in a reciprocating motion on the inner wall of the arc starting end of the high-voltage electrode, which can significantly improve the heat dissipation effect, enhance the stability of the arc and reduce ablation. In this way, the power of the sliding arc can be increased, thereby enhancing the plasma density, increasing the plasma temperature and volume, and enhancing the ignition characteristics.

[0024] 2. The present invention regulates the airflow through a built-in pulse regulator, which has the characteristics of compact structure and reliable operation. Since the pulse regulator is close to the cyclone outlet and the buffer area is small, the gas pulse characteristics can be more accurately transmitted to the inner and outer wall surfaces of the high-voltage electrode, which can increase the pulse frequency and realize small flow pulse regulation.

[0025] 3. The ground electrode of the present invention has three structural features: a necked opening, a flat opening and a flared opening. The necked opening combined with the flat opening structural features can improve the stability of the arc, especially when the power reaches 5kW or above, and can effectively avoid the risk of arc breaking. The flared opening feature mainly has the effect of causing the discharge air to pass through the necked opening first and then through the flat opening, which will produce a certain acceleration effect. A negative pressure zone will be formed at the flared position, and the negative pressure zone will suck in the fuel outside the ground electrode to form a stable combustion area, thereby improving the stability of the igniter.

[0026] 4. There is a chute feature in the middle of the fuel distributor. Since the gap between the fuel distributor and the outer tube is smaller than the gap between the ground electrode support tube and the outer tube, the fuel will experience a pressure increase process when flowing from the larger gap to the smaller gap. During this process, part of the fuel will enter the plasma discharge area from the chute. Due to the structural characteristics of the chute, the passing fuel has a certain rotation effect to form turbulence, which can make the fuel and the discharge air mix well and be sucked into the ground electrode expansion to participate in the primary combustion. The fuel directly ejected from the gap between the fuel distributor and the outer tube is in a laminar state and is ignited by the primary combustion flame, and an axial large-scale flame can be obtained.

[0027] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the main cross-sectional structure of a dual-airflow sliding arc ignition and combustion stabilization device according to an embodiment of the present invention is shown;

[0030] Figure 2 A schematic cross-sectional view of a dual-airflow sliding arc ignition and combustion stabilization device according to an embodiment of the present invention is shown;

[0031] Figure 3 shows a schematic cross-sectional structure diagram of a high-voltage electrode according to an embodiment of the present invention;

[0032] Figure 4 shows a schematic cross-sectional structure diagram of a pulse regulator according to an embodiment of the present invention;

[0033] Figure 5 A top view of a valve body in a pulse regulator according to an embodiment of the present invention is shown;

[0034] Figure 6 A schematic cross-sectional structure diagram of a tailstock according to an embodiment of the present invention is shown;

[0035] Figure 7 shows a schematic diagram of an axonometric view of a rear tailstock according to an embodiment of the present invention;

[0036] Figure 8A schematic diagram of uniform pore distribution of an anode support tube according to an embodiment of the present invention is shown;

[0037] In the figure, the reference numerals are: 1, high-voltage electrode; 101, high-voltage arc starting end; 1011, cooling fin ring; 1012, inner wall surface; 1013, outer wall surface; 102, ceramic plate; 1021, first swirl hole; 103, high-voltage electrode seat; 1031, vent hole; 1032, high-voltage connecting hole; 1033, high-voltage electrode cavity; 1501, second swirl hole; 2, ground electrode; 201, shrinkage; 202, flat mouth; 203, expansion; 3, fuel distributor; 301, chute; 302, outer thread of ground electrode support tube; 4, pulse regulator; 401, valve body; 4011, plate hole; 4012, Threading hole; 4013, small hole; 4014, medium hole; 4015, large hole; 4016, extra-large hole; 402, motor; 403, valve core; 4031, gas regulating hole; 404, bracket; 5, outer tube; 6, ground electrode support tube; 601, gas equalizing hole; 7, rear tailstock; 701, inner cavity; 702, limiting step; 703, rear tailstock outer ring thread; 704, rear tailstock inner ring thread; 705, tailstock bottom plate; 706, high-voltage wire hole; 8, tailstock; 9, protective tube; 10, grounding pile; 11, air inlet; 12, fuel inlet; 13, sealing gasket; 14, high-voltage wire; 15, ceramic swirl ring. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0039] It should be noted that the terms "first", "second" etc. in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the application described herein. In this application, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "center", "vertical", "horizontal", "lateral", "longitudinal" etc. are based on the directions or positional relationships shown in the accompanying drawings.

[0040] The present invention provides a dual-flow sliding arc ignition and stabilization device, which can improve the ignition power of sliding arc plasma, increase plasma density and volume, increase plasma temperature, and generate more active particles. The fuel is divided into a central turbulent flow and a surrounding laminar flow by a fuel distributor, thereby maximizing the ignition energy. While igniting the main fuel, the outer laminar main fuel is also heated, ultimately achieving the purpose of igniting difficult-to-burn fuel.

[0041] See also Figures 1-8 As shown, this embodiment provides a dual-airflow sliding arc ignition and stabilization device, which includes a high-voltage electrode 1, a ground electrode 2, a ceramic cyclone ring 15, a pulse regulator 4, and a fuel distributor 3.

[0042] Preferably, the high-voltage electrode 1 includes a high-voltage arc-starting end 101, a ceramic plate 102, and a high-voltage electrode seat 103. The high-voltage electrode seat 103 is threadedly connected to the ceramic cyclone ring 15. The high-voltage electrode seat 103 is threadedly connected to the high-voltage arc-starting end 101. The ceramic plate 102 is installed between the high-voltage electrode seat 103 and the high-voltage arc-starting end 101, wherein the high-voltage arc-starting end 101 is a circular ring structure, and a cooling fin ring 1011 is provided on the outside of the high-voltage arc-starting end 101. A first cyclone hole 1021 is provided on the ceramic plate 102, and the rotation direction of the first cyclone hole 1021 is the same as the rotation direction of the second cyclone hole 1501 on the ceramic cyclone ring 15.

[0043] Preferably, the discharge working position of the high-voltage electrode 1 is at the high-voltage arc starting end 101, and the high-voltage arc starting end 101 is annular, and the annular shape is divided into an inner wall surface 1012 and an outer wall surface 1013. The pulse airflow of the inner wall surface 1012 and the outer wall surface 1013 of the high-voltage electrode is derived from the same gas through the vent 1031, and can also be supplied by two gases separately.

[0044] Preferably, Figure 4 , Figure 5As shown, the pulse regulator 4 includes a valve body 401, a valve core 403 and a motor 402. The valve body 401 is circular with a circular groove in the middle. The valve core 403 is built into the circular groove. The valve core 403 is connected to the motor 402 through an axis. The motor 402 is fixed on the bracket 404. The bracket 404 is fixed on the valve body 401. A plurality of holes of different sizes are arranged on the groove in the middle of the valve body 401. There is a hole on the valve core 403. The valve core 403 rotates at a certain speed under the action of the motor 402. The hole on the valve core 403 is constantly in contact with the valve body 401. The holes of different sizes in the groove overlap. After passing through the gas regulating hole of the valve core 403, the air passes through the small hole 4013, the medium hole 4014, the large hole 4015, and the extra-large hole 4016 on the valve body in turn, forming a fluctuating pulse airflow, wherein the distances between the centers of the small hole 4013, the medium hole 4014, the large hole 4015, and the extra-large hole 4016 and the center of the valve body 401 are equal. There is a threading hole 4012 on the outside of the central groove of the valve body 401. The high-voltage wire 14 passes through the threading hole 4012 and the high-voltage wire hole 706 on the rear tail seat 7 to connect the power supply to the high-voltage electrode 1.

[0045] Preferably, the fuel distributor 3 can divide the fuel into central turbulence and outer horizontal flow through the inclined groove 301. The central turbulence can increase the mixing effect of air and fuel and enhance combustion stability. The outer horizontal flow can delay the mixing time of air and fuel and increase the scale of flame distribution in the axial direction.

[0046] Preferably, the high voltage electrode 1 and the ground electrode 2 are coaxially arranged, the gap between the outer diameter of the high voltage electrode 1 and the inner diameter of the ground electrode support tube 6 is 1.5mm-4mm, and the ground electrode 2 has three structural features: a narrowed opening 201, a flat opening 201, and a widened opening 203.

[0047] Preferably, the fuel distributor 3 is threadedly connected to the outer ring of the ground electrode support tube 6. A plurality of inclined grooves 301 are opened in the middle of the fuel distributor 3. The angle between the inclined grooves 301 and the central axis of the fuel distributor 3 is 15°-75°. The fuel distributor 3 is made of high-temperature resistant metal.

[0048] Preferably, in addition to the small hole 4013, the medium hole 4014, the large hole 4015, and the extra-large hole 4016, the valve body also has a normally open plate hole 4011, the speed of the motor 402 is adjustable, and the diameter of the gas regulating hole 4031 on the valve core 403 is greater than or equal to the extra-large hole 4016.

[0049] Preferably, the fuel enters the cavity between the tailstock 8 and the rear tailstock 7 from the fuel inlet 12, passes through the gas equalizing hole 601 of the ground electrode support tube 6, and a portion of the fuel is ejected out of the igniter along the gap between the outer tube 5 and the fuel distributor 3. There are multiple inclined grooves 301 on the fuel distributor 3, and a portion of the fuel enters the inner side of the fuel distributor 3 through the inclined grooves 301. The fuel entering the inner side of the fuel distributor accounts for 10%-50% of the total flow.

[0050] Preferably, the air passes through a branch path, and under the action of the ceramic cyclone ring 15 and the first cyclone hole 1021, there is a rotating airflow on both the inside and outside of the high-voltage electrode arc starting end 101. Alternatively, two rotating airflows can be introduced into the inside and outside of the high-voltage electrode arc starting end 101 respectively.

[0051] Among them, the discharge gas enters the inner cavity 701 of the rear tailstock 7 from the air inlet 11, and the air inlet 11 is installed on the outside of the tailstock base plate 705. The outside of the tailstock base plate 705 is provided with a grounding pile 10, and the grounding pile 10 is composed of a threaded hole and a screw. The inner cavity 701 of the rear tailstock 7 is provided with a pulse regulator 4, and the pulse regulator 4 is installed on the limiting step 702. The pulse regulator 4 includes a valve body 401, a valve core 403 and a motor 402. The valve body 401 is provided with a plurality of holes of different sizes, and the valve core 403 has a hole. The valve core 403 rotates at a certain speed under the action of the motor 402. The hole on the valve core 403 constantly coincides with the holes of different sizes on the valve body 401. After passing through the hole in the valve core 403, the air passes through the small hole 4013 and the middle hole 401 on the valve body in turn. 14. Large holes 4015 and extra-large holes 4016 form a fluctuating pulsed airflow. The rear tailstock inner thread 704 is threadedly connected to the ceramic swirl ring 15, which is connected to the high-voltage electrode 1. The ground electrode support tube 6 is connected to the rear tailstock outer thread 703. The ground electrode support tube 6 is coaxially arranged with the high-voltage electrode 1. The ground electrode 2 is threadedly connected to the inner thread of the ground electrode support tube 6. The fuel distributor 3 is threadedly connected to the outer thread of the ground electrode support tube 6. The rear tailstock 7 is mounted on the rear seat 8, which is mounted on the outer tube 5. The high-voltage wire 14 is connected to the high-voltage electrode 1 and passes through the high-voltage wire hole 706 of the rear tailstock 7 to connect to the power supply. Compared with other non-pulse gas or external pulse gas regulation methods, the pulse regulator 4 of the present invention can move the high-voltage electrode arc root axially, increasing the arc root swept area. Because the pulse regulator 4 is close to the gas outlet participating in the discharge, the buffering effect of the transmission channel on the fluctuating gas can be reduced, and the pulse effect is more obvious.

[0052] Part of the pulse air flow flowing out of the pulse regulator 4 enters the second cyclone hole 1501 of the ceramic cyclone ring 15 and flows out and flows along the outer wall of the high-voltage electrode 1. The angle between the second cyclone hole 1501 of the ceramic cyclone ring 15 and the axis is 45°~60°. The other part first enters the high-voltage electrode inner cavity 1033 through the air vent 1031 of the high-voltage electrode, and the air flow then passes through the first cyclone hole 1021 of the ceramic plate 102. Under the action of the first cyclone hole 1021 on the ceramic plate 102, a rotating air flow is formed to flow along the inner wall of the arc starting end 101 of the high-voltage electrode. The air flow on the inner wall of the high-voltage electrode has the same rotation direction as the air flow on the outer wall of the high-voltage electrode.

[0053] The outer wall of the arc starting end 101 of the high voltage electrode is provided with a cooling fin ring 1011. The cooling fin ring 1011 can increase the contact area between the high voltage electrode 1 and the outside air, thereby increasing the cooling effect and extending the life of the electrode.

[0054] The high-voltage wire 14 is installed in the high-voltage connection hole 1032 at the tail of the high-voltage electrode 1 and passes through the high-voltage wire hole 706 of the rear tailstock 7 to be connected to the power supply.

[0055] Due to the physical properties of the sliding arc, the high-voltage electrode arc root temperature is high, reaching approximately 3000K to 5000K. The arc also exhibits self-contraction properties. During discharge, the outer wall of the high-voltage electrode arc-starting end 101 first forms an arc with the inner wall of the ground electrode support tube 6. Under the action of the arc's self-contraction, the high-voltage electrode arc root rapidly contracts from the outer wall of the high-voltage electrode arc-starting end 101 to the inner wall 1012 of the high-voltage electrode arc-starting end 101. Under the influence of the pulsed rotating airflow on the inner wall 1012 of the high-voltage electrode arc-starting end 101, the high-voltage electrode arc root performs a spiral motion on the inner wall 1012 of the high-voltage electrode arc-starting end 101. When the velocity of the rotating airflow on the inner wall of the high-voltage electrode arc-starting end 101 increases, the rotational trajectory of the high-voltage electrode arc root deviates toward the opening of the high-voltage electrode arc-starting end 101. When the velocity of the rotating airflow on the inner wall of the high-voltage electrode arc-starting end 101 decreases, the rotational trajectory of the high-voltage electrode arc root contracts and deviates away from the opening of the high-voltage electrode arc-starting end 101. This increases the swept area of ​​the high-voltage electrode arc root from a single point in conventional reactors to the cylindrical surface inside the high-voltage electrode arc-starting end 101. This allows the electron emission position to be continuously shifted across the entire surface, and the location of the high-voltage electrode's heat generation point to continuously spiral. Simultaneous gas cooling inside and outside the high-voltage electrode arc-starting end 101 effectively removes heat.

[0056] The ground electrode support tube 6 is connected to the outer thread 703 of the rear tailstock. The ground electrode support tube 6 is coaxially arranged with the high-voltage electrode 1. The ground electrode 2 is connected to the inner thread 704 of the ground electrode support tube. The ground electrode support tube 6 is equipped with an equalizing ring 601. Fuel enters the interlayer between the tailstock 8 and the rear tailstock 7 from the fuel inlet 12 and flows evenly toward the outlet under the action of the equalizing ring 601. The rear tailstock 8 is threadedly connected to the protective tube 9. The protective tube 9 is installed in conjunction with the corrugated tube, allowing the high-voltage wire 14 to be built into the corrugated tube to provide insulation protection.

[0057] The fuel distributor 3 is connected to the outer thread 302 of the ground electrode support tube and is replaceable. Multiple chute slots 301 are defined in the center of the fuel distributor 3, with angles between the chute slots 301 and the central axis of the fuel distributor 3 ranging from 15° to 75°. The fuel distributor 3 is made of high-temperature-resistant metal. Because the gap between the fuel distributor 3 and the outer tube 5 is smaller than the gap between the ground electrode support tube 6 and the outer tube 5, the fuel experiences a pressure increase as it flows from the larger gap to the smaller gap. During this process, some fuel enters the plasma discharge region through the chute slots 301. Because the chute slots 301 are angled with the centerline, the fuel flowing inward through the chute slots 301 experiences a certain rotational effect and forms turbulent flow, which effectively mixes the fuel with the discharge air and enhances ignition characteristics. Advantageously, a portion of the fuel is entrained by the ground electrode flare 203 into the discharge region to participate in the primary combustion. The fuel ejected directly from the gap between the fuel distributor 3 and the outer tube 5 flows in a laminar state and is ignited again by the primary combustion flame, resulting in a large-scale axial flame.

[0058] The rear seat 7 is mounted on the rear seat 8. A sealing gasket 13 is used to seal between the rear seat 7 and the rear seat 8 to prevent fuel leakage. The sealing gasket 13 can be made of rubber or polytetrafluoroethylene. An outer tube 5 is mounted on the rear seat 8.

[0059] The ground electrode 2 has three structural features: a constricted opening 201, a flat opening 202, and a flared opening 203. The constricted opening 201 and the flat opening 202 structural features can improve the stability of the arc, especially when the power reaches 5kW or above, which can effectively avoid the risk of arc breaking. The flared opening 203 structural feature mainly functions to accelerate the discharge air passing through the constricted opening 201 and then through the flat opening 202. A negative pressure zone is formed at the flared opening 203 position, which attracts the fuel outside the ground electrode 2, forming a stable combustion area and improving the stability of the igniter. Preferably, the axial distance between the constricted opening and the high-voltage electrode is 20mm to 30mm, and the constricted opening 201, the flat opening 202, and the flared opening 203 are arranged in order from near to far from the high-voltage electrode 1.

[0060] The present invention uses high-power sliding arc plasma to continuously ignite the combustion-supporting fuel, thereby improving the ignition success rate of the ignition device. The igniter of the present invention can be used in burners in application scenarios where the fuel ignition point is high and the flame propagation speed is slow.

[0061] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-flow sliding arc ignition and stabilization device, characterized in that: It includes a high-voltage electrode, a ground electrode, a ceramic cyclone ring, a pulse regulator, and a fuel distributor; the discharge gas enters the rear tail seat cavity from the air inlet, and the rear tail seat cavity is equipped with a pulse regulator. The pulse regulator includes a valve body, a valve core and a motor. The valve body is provided with a plurality of holes of different sizes, and the valve core has a gas regulating hole. The valve core rotates at a certain speed under the action of the motor, and the holes on the valve core constantly coincide with the holes of different sizes on the valve body. After passing through the gas regulating hole of the valve core, the air passes through the small holes, the middle holes and the like on the valve body in turn. The holes, large holes and extra-large holes form a fluctuating pulse airflow, the inner thread of the rear tailstock is threadedly connected to the ceramic swirl ring, the ceramic swirl ring is connected to the high-voltage electrode, the ground electrode support tube is threadedly connected to the outer thread of the rear tailstock, the ground electrode support tube and the high-voltage electrode are coaxially arranged, the ground electrode is threadedly connected to the inner thread of the ground electrode support tube, the fuel distributor is threadedly connected to the outer thread of the ground electrode support tube, the rear tailstock is installed on the rear seat, the rear seat is equipped with an outer tube, the high-voltage wire is connected to the high-voltage electrode and is connected to the power supply through the high-voltage wire hole of the rear tailstock; The fuel enters the cavity between the tailstock and the rear tailstock from the fuel inlet, passes through the gas equalizing holes of the ground electrode support tube, and a part of it is ejected out of the igniter along the gap between the outer tube and the fuel distributor.

2. A dual-airflow sliding arc ignition and combustion stabilization device according to claim 1, characterized in that: The high-voltage electrode has a hollow structure and is connected to the inner cavity of the ceramic cyclone ring through a vent. A ceramic plate is built into the middle of the high-voltage electrode. There are multiple first cyclone holes on the ceramic plate, and the direction of the first cyclone holes is consistent with the direction of the second cyclone holes of the ceramic cyclone ring.

3. The dual-airflow sliding arc ignition and combustion stabilization device according to claim 1, characterized in that: The high-voltage electrode includes a high-voltage electrode seat, a high-voltage arc starting end, and a ceramic plate. The high-voltage electrode seat is threadedly connected to the ceramic swirl ring, and the high-voltage electrode seat is threadedly connected to the high-voltage arc starting end. The ceramic plate is installed between the high-voltage electrode seat and the high-voltage arc starting end, wherein the high-voltage arc starting end is a circular ring structure, and a cooling fin ring is provided on the outside of the high-voltage arc starting end.

4. The dual-airflow sliding arc ignition and combustion stabilization device according to claim 1, characterized in that: The high-voltage electrode and the ground electrode are arranged coaxially, and the gap between the outer diameter of the high-voltage electrode and the inner diameter of the ground electrode support tube is 1.5mm-4mm. The interior of the ground electrode has three structural features: a necked opening, a flat opening, and a flared opening. The axial distance between the necked opening and the high-voltage electrode is 20mm~30mm. The necked opening, flat opening, and flared opening are arranged in order from near to far according to the distance between them and the high-voltage electrode.

5. The dual-airflow sliding arc ignition and combustion stabilization device according to claim 1, characterized in that: The fuel distributor is threadedly connected to the outer ring of the ground electrode supporting tube.

6. The dual-airflow sliding arc ignition and combustion stabilization device according to claim 1, characterized in that: A plurality of inclined slots are provided in the middle of the fuel distributor, and the angle between the inclined slots and the central axis of the fuel distributor is 15°-75°. The fuel distributor is made of high-temperature resistant metal.

7. The dual-airflow sliding arc ignition and combustion stabilization device according to claim 1, characterized in that: There is also a normally open plate hole on the valve body, the speed of the motor is adjustable, and the diameter of the gas regulating hole on the valve core is greater than or equal to the extra-large hole.

8. The dual-airflow sliding arc ignition and combustion stabilization device according to claim 6, characterized in that: A portion of the fuel enters the inner side of the fuel distributor through the chute, and the fuel entering the inner side of the fuel distributor accounts for 10%-50% of the total flow.

9. The dual-airflow sliding arc ignition and combustion stabilization device according to claim 1, characterized in that: The air passes through the branch path, and under the action of the ceramic cyclone ring and the first cyclone hole inside the high-voltage electrode, there is a rotating airflow on both the inside and outside of the arc starting end of the high-voltage electrode, or two rotating airflows are introduced into the inside and outside of the arc starting end of the high-voltage electrode respectively.

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